Present Open Meaning
Posits a real possibility of a specific instance of action which may in fact be occurring; Clause contains no indication as to whether or not the condition is being fulfilled.
Past Open Meaning
Posits a real possibility of a specific instance of action which may in fact have occurred or been occurring; Clause contains no indication as to whether or not the condition was fulfilled.
Future Open (Vivid) Meaning
Posits a real possibility of a specific instance of action which may in fact yet occur; Clause contains no indication as to whether or not the condition will be fulfilled.